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  • Organic Chemistry  (1)
  • growth-retarding effect  (1)
  • 1980-1984  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 35 (1984), S. 11-16 
    ISSN: 1570-7458
    Keywords: Azadirachta indica ; Aedes aegypti ; neem seed kernel extracts ; insect growth regulators ; growth-retarding effect ; natural insecticides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Zehn mit Wasser und verschiedenen organischen Lösungsmitteln hergestellte Niem-Samen-Extrakte wurden auf ihre Wirkung auf Larven der Gelbfiebermücke Aedes aegypti untersucht. Dauerhaltung der Viertlarven in behandeltem Wasser führte zu einer beträchtlichen wachstumshemmenden Wirkung, die hauptsächlich während der Imaginalentwicklung in Erscheinung trat. Der Wirkungsgrad der Extrakte steigerte sich im biotest mit abnehmender Polarität der bei der Extraktion verwendeten Lösungsmittel. Drei Extrakte (ANSKE, AZT-VR-K-E und MTB/H2O-K-NR-E) deren Wirkung auch auf Erstlarven untersucht wurde, verursachten erhebliche Entwicklungsverzögerungen wenn die Larven bis zum Erscheinen der Imagines behandeltem Wasser ausgesetzt waren. Die von den Extrakten verursachte Mortalität trat zu einem ähnlichen Zeitpunkt ein, wie er für einige synthetische Insektenwachstumshemmer berichtet wird.
    Notes: Abstract Bioassays against larvae of Aedes aegypti were conducted with neem seed kernel extracts obtained by extraction with water and organic solvents. Permanent exposure of fourth instar larvae to treated water resulted in a conspicuous growth-disrupting effect, mainly during imaginal development. The effectiveness of the extracts increased with decreasing polarity of the solvents used for extraction. Three neem seed kernel extracts caused an extreme prolongation of the larval period when first instar larvae were continuously exposed to treated water until adult emergence. The time necessary for lethal action of neem seed kernel extracts to set in was similar to that reported for some synthetic IGR's.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 680-684 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetic Studies of the Reactions of Methyl Radicals with AlleneThe addition of methyl radicals to allene has been studied in the temperature range 573…595 K. The methyl radicals were produced by thermal decomposition of azomethane. It has been shown that the additions take place with a very high selectivity at the terminal carbon atoms in allene. The rate constant k2 of the addition can be expressed by the following Arrhenius equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm k}_{{\rm 2 }} = 10^{7,76 \pm 0,2} {\rm e}^{{{ - \left({28,6 \pm 1,0} \right){\rm kJmol}} \mathord{\left/ {\vphantom {{ - \left({28,6 \pm 1,0} \right){\rm kJmol}} {{\rm RT}}}} \right. \kern-\nulldelimiterspace} {{\rm RT}}}} {\rm M}^{ - 1} {\rm s}^{ - 1} $$\end{document}
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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